Try a new OVP relay -- if it's bad, it won't give starting enrichment. so in spite of the cold start valve it will be reluctanct to start.
Also check all the vac lines and the idle control valve hoses for hardness, loose fit, or cracks -- a large vac leak while attempting to start will give you fits, as there will be little or no airflow through the air flow sensor, and thus no fuel. A mis-adjusted fuel distributor will do the same thing, it needs to have the zero flow position set correctly.
Peter
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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!
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